[Jack-Devel] How to capture audio from speaker?

[Kjetil Matheussen]

On Tue, May 14, 2019 at 11:01 AM <garden_9652 at yahoo.co.jp> wrote:
>
> Hi
>
> I have install jack_capture and how can I run it?
>
> $ jack_capture
> ./jack_capture
> Cannot connect to server socket err = No such file or directory
> Cannot connect to server request channel
> jack server is not running or cannot be started
> JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
> JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
> >>> jack_client_open() failed, status = 0x11
>
>
> So I start jackd :
>
> $ jackd -d coreaudio
>
> then start jack_capture
>
> $ jack_capture
>
> then it starts to record, but the audio file I got jack_capture_01.wav is just blank
>
> Anything wrong?
>

Is jack playing anything? (jack_capture only records audio played by jack)